Improved slate-polishing machine



dialnettant Letters Patent Nc. 94,310, dated August 31, 1869.

IMPROVED SLATE-POLISHNG- MACHINE.

The Schedule referred to inthese Letters Patent and making part of the same.

To all -whom it may concern Be it known that I, S'rrsson Eisenman,l of Weissport, Carbon county, Pennsylvania, have invented a new and improved Slate-Polishing Machine; and l do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, ,forming part of this specification, in which- Fig'ure l is aside elevation of my improved machine. v

Figure 2 is a detail horizontal sectional view of the same, taken on the line a: z, tig. 1.

Similar letters of reference indicate corresponding parts.

' This invention relates to a machine for grinding and polishing lnarble, slate, and other suitable material.

It consists in the use of a large grinding-wheel, which is mounted on a. vertical shaft, and below the face of which a number of small disks are arranged, which are mounted on the top ends of vertical shafts, which can be raised and lowered at will, and upon which the material to be ground or polished is placed.

By raising the said disks, the material to be ground is`b ronght in contact with the face of the grindingwheel, and may then be ground otf or polished as desired. i

A represents an upright frame, lha-de of wood or other suitable material, in the horizontal barsof` which suitable bearings for a vertical shaft, B, are arranged.

On the shaft B is mounted a wheel, C, of suitable dimensions, and made of pumice-stone' or other suitable grinding-material, or coated with the saine, asniay he desired.

A pulley, D, is mounted on the shaft B, and a belt passing over the same imparts motion to the shaft On the frame A are also arranged bearings for any desirable number-of small vertical shafts E E, which are arranged at equal distances from the shaft B.

The shafts E can slide up and down in their bearings, and on top of each of them is mounted a disk, E, within the surface of which a rectangular or other mortise is arranged, in whichthe slate or article to be ground is placed, and held by a set-screw, a, asis more clearly shown in tig. 2.

The lower end of each shaft E rests upon the inner arm of a lever, or treadle, G, whereby it can be raised or lowered at will. Y

Byplacing a slate upon one of the disks, F, and

raising the shaft E, the upper surface of the slate can b e brought against the under surface of the grindingwheel C, and by revolving the latter, and constantly pressing the disk upward, the face of the slate will be ground perfectly level and smooth. v

A gauge, b, in shape of an np-and-down adjustable ling, or sleeve, is placed around each shaft E, and is held in any desired position by a set-screw, c.v

The shaft E cannot be raised any further, as soon as the gauge l) strikes against one of -the horizontal bars of the frame A.

The shafts E may be made stationary, that is, not revolving, orv they can be provided with toothed wheels d d, which mesh into a pinion, e, which isT mounted on the shaft B. They will then revolve in the opposite direction from the shaft B.

A set of disks for holding slates may also be arranged above the wheel C, so as to be brought against the upper surface of the same.

Instead of being vertical, the shafts B and wheel C may also be arranged horizontal, and operate equally well.

I claim as new, and desire to secure by Letters Patentl. 'In a slate-polishing machine, the combination ot' the horizontal grinding-wheel G with the mortised disks F, shafts E, either stationary or revolving, gauges l1, and levers G, whereby the said disks Fare elevatedv or depressed, all constructed rand operating substantially as herein .shown and described.

'2. The construction and arrangement in the frame A, upon each side of the centre shaft B, of horizontal mortised disks Frupon the vertical shafts E, either revolvingl or stationary, provided with the adjustable n gauges b, and elevated or vdepressed by means of .the

levers G, substantially as herein shown and described;-

3. The construction and 4arrangement of the vertical shaft B, supporting the horizontally-revolving wheel C, the mortised disks l", upon the shafts E, pressing the slate to be ground against the under surface of the grinding-wheel G, as herein shown and described.

4. rlhe construction and arrangement of the levers G, pivoted in the frame A, and supporting upon their inner ends the vertical shafts E, substantially as herein set forth for the purpose specified.

STINSON HAGAMAN. Witnesses:

WM. F. MGNAMARM ALEX. F. ROBERTS. 

